Dough-mixing machine.



C. STIRIZ. DOUGH MIXiNG MACHINE. APPLICATION FILED IEB.26, 1910.

1,0623%01 Patented May 20, 1913.

est: g l Inventor:

, UNITED STATES PATENT OFFICE.

CHARLES STIRIZ, OF NEW YORK, 1N. Y., ASSIGNOR OF ONE-HALF TO ANNA A.STIR or NEW YORK, N. Y.

DOUGH-MIXING MACHINE.

Specification of Letters Patent.

Patented May 20, 1913.

Application filed February 26, 1910. Serial No. 546,058.

which form a' part thereof.

My invention relates to dough mixers, and more particularly to a type ofdough mixer adapted for use in bakeries wherein large quantities ofdough are handled.

in a single structure means for mixing and mixed.

A further object is to provide a power driven dough mixer havingremovably attached to the top thereof a fiour'sifteron sieve whereby theflour may be sifted andf mixed directly within the trough of the mixerthus avoiding the necessity for a mixers of this character.

A still further object is to provide a combined dough mixer and sifterwherein the constantly agitated by the mixing and wherein the agitatorsof the sieve will be driven simultaneously with said blades! A stillfurther object is to provide a dough mixer having a sifter hinged abovethe trough thereof whereby said sifter may be swung free of the top ofthe trough so as to permit the overturning or tilting of 4 the trough,and the handling of the dough,

without interferencefrom said sift-er.

A still further object is to provide in a dough mixer employing rotaryblades, means for automatically clearing the edges of the blades toobviate the necessity of the operator placing his hands within thetrough for this purpose.

A still further object is to 'provide in a dough mixer, a blade scraperhaving a lateral movement underv the influence of the helicoidalbladesto impart a lateral shearhad therein to the accompanying drawings,-

The main object of the invention is to' provide a dough mixer embodyingtherein,f

separate flour mixer, sieve and elevator system now commonly used inconnection-with.

. pitchedlaterally and toward the center of flour deposited in thesifter will be delivered directly into the dough trough where it isblades,

'vator driven from the same or b ing movement thereto and at the sametime automatically and properly position said scraper relative to theblade to be cleaned thereby. And a still further object is to provide acleaning device for the mixing blades which in its operation will tendto aid in the disintegration of the mass of dough thereof.

The invention consists in the novel features of construction andcombination of parts hereinafter set forth and described and moreparticularly pointed out in the claims hereto appended.

Referring to the drawings :-Figure 1 is a front view of a dough mixerembodying my-invention with the sieve in place, the front of the troughbeing broken away to disclose the interior arrangements of the mixer;Fig. 2 isa section through the trough on the line 2-2 of Fig. 1, andFig. .3 is a detailed view of the mixer blades cleaning Like lettersrefer to like parts throughout the several views.

In the accompanying drawings, I have shown at a a tilting trough mountedbetween suitable standards b. Passing through the trough a is a shaft 0carrying helicoidal mixing blades '03 of'theusual and well knownconstruction. Both of said blades (1 are the trough a and the shaft 0.Said mixer blades are driven through the entrained gears e by the motorf, the last gear 6, of the train e, being mounted upon one end of theshaft 0 and a similar gear 6 in mesh with the'pinion 6 being carried bythe other end of said shaft. This construction is old and well known inthis art, its purpose being to cause the blades d to work and aerate thedough in the trough a, said trough being tilted downwardly to dischargethe contents thereof upon the kneading board or other suitablereceptacle.

As now commonly used, the'trough a is open at the top and the doughmixer-is used in conjunction with a flour mixer and elea P- aratemotor,the flour being mixe in said auxiliary machine and conveyed anddischarged into said trough. This arrangement results in a loss of floorspace in addition to the additional cost of the equipment. To obviatethis ditficulty, I provide a flour sifter adapted to be positioned inthe open to insure a more thorough aeration top of the trough it thusnot only permitting the flour to be sifted directly into the trough,

but causing the mixer blades 03 to thoroughly mix this flour as it is sodelivered. This sifter consists of a frame 9 mounted upon an extension71, of the standard I) which frame carries the screen 2' projectingwithin the trough a. This screen or sifter will ordinarily have acapacity of between one and two barrels, thus permitting the entire massof flour to be sifted into the trough at one time.

Mounted in suitable hearings in the frame 9 is a rotary frame y'carryingagitators is adapted to engage a considerable area at the bottom of thesieve i for the purpose of thoroughly sifting the flour. Preferably theagitator 7c embodies therein a plurality of bristles. The shaft is ofthe agitator k has mounted upon the opposite ends thereof pinions 1adapted to mesh with the gears e 6 respectively, thus causing saidagitator to be driven from the same motive power as the mixing blades(1, and simultaneously therewith. The frame 9 being hinged to thestandards supporting the trough, and independently of the trough itself,when it is desired to mix or discharge the dough, it is is merelynecessary to swing the entire frame 9 upwardly to allow a clear fieldfor the handling of the trough itself either while mixing the dough orwhen it is desired to discharge same. This construction combines in onestructure a complete flour sifting and dough mixing apparatus and onewhich will occupy but small floor space while permittmg the dough mixerto be used in the usual and well known manner. I

In us ng a dough mixer of this character,

there is a tendency of the dough to adhere to the mixer blades .d thusimpairing the efficiency of these blades and at the same timeinterfering with the proper aeration of the mass ofdough. To keep theseblades clear in the ordinary machine, the operator has-to frequentlyscrape same with a knife and as this is done while the mixer blades arerotating, the operation is not only. in convenient, but frequentlyresults in injury to the operator. To obviate this difliculty, I

provide means actuated automatically by the mixer blades themselveswhereby, with each rotation thereof, the dough is scraped from thegreater-portion of theoperative area thereof keepin said blades clearand at the same time disintegrating or breaking up the mass of dough ina manner to more thoroughly aerate same. This means consists of aplurality of sliding scrapers m m mounted upon a shaft n having afeather n,

said scrapers being capable of lateral movement upon said shaft whenpropelled by the helicoidal blades d. The scrapers .m m are spaced apartsufliciently to bring one of them at least, into operative engagementwith one of the blades Z; the lateral movement of said scrapersresulting in the automatic positioning ofv one of them in the path ofits mixer blade, the lateral traverse along the edge of said bladeresulting in the removal ofany dough adhering thereto.

ciprocatory movement under the influence of the helicoidal mixer bladeswhereby each mixer blade, with each rotation/thereof, has the doughscraped therefrom.

The operation of he herein described dough mixer is substantially asfollows When it is desired to charge the trough a with flour, the barrelor other receptacle containing the'flour is raised by hand or in anyother desired manner and its contents dumped into the sifter or 'sieve iwhich has beenlowered so as, to bring its gears Z into mesh with thegears e e. The desired proportion of the contents of said receptaclehaving been delivered to said sieve, or screen, the motor f is started,thus rotating the agitators 7c and the mixer blades (2. The flour isthus sifted directly into the trough a and as it is" delivered thereto,it is thoroughly mixed by-the mixer blades 65, the agitator is acting inthe "usual and well known manner. Whenthe flour is thoroilghly mixed inthe trough a, the frame .g is raised, leaving the trough open at the'top so as to permit the admission of the' other ingredients for thedough, or the tilting of the trough a to dischargejthe mixed.

toward the center of the trough, through tlie'continuous rotation ofsaid blade, said scraper in its lateral traverse freeing the entire edgeof the mixing blade from any dough adhering thereto. As it reaches thelast ,ed e of the'mixer'blade; the scraper om the influence of thisblade and passes While moving ceases its lateral traverse.

as described, said scraper imparts afsimilar movement to the otherscraper m'..t-hrough the spring 0, both. said scra ers moving upon'thesha t and being eld against oscillation thereon by the feather 71/. As

its blade, the other scraper m is positioned directly within the'pathof, and in a similar position relative to, the opposite mixer blade dand both scrapers are thus restored totheir former positions preparatoryto a repetition of this operation. By this means the mixing blades arekept comparatively free from dough, and the mass of such dough is thusmore thoroughly disintegrated or broken up and aerated without thenecessity for the operator cleaning the blade. r j

Ordinarily tilting means are provided for the trough abut I have notshown such in the drawings as such mechanism forms no part of myinvention.

It is not my intention to limit my invention to the precise details ofconstruction shown in the accompanying drawings, it being apparent thatsuch may be varied without departing from the spirit and scope of theinventio Having described the invention, what I claim as new, and desireto have protected by Letters Patent, is

1. In a dough mixing machine, the combination with a tilting mixingtrough, a rotary mixing blade mounted upon a. transverse shaft therein,and a driving gear attached to said shaft, of a frame pivotally mountedadjacent to the rear edge of the open top of-said trough, a sifter orsieve carried by sald frame and pro ecting into said trouglrto a pointabove said mixing blade, a transverse rotary shaft mounted in saidframe, a gear carried by said shaft and adapted to mesh with the drivinggear of said mixing blade, whereby said frame may be raised in itsentirety from above said trough to permit access thereto, and saiddriving gear upon said last named shaft will be automatically throwninto and out of gear with said main driving gear, and a frame carried bysaid shaft and said sifter frame, said frame carrying a plurality offlexible agitators.

2. In a dough mixer, the combination with a trough, and a rotary mixingblade therein, of a laterally I CiProcatory scraper adapted'to engage,move along and scrape the dough from, the edge of said blade.

3. In a dough mixer, the combination with a trough and a rotaryhelicoidal blade therein, of a scraper mounted in said trough andprojecting into the path of said mixer blade, whereby said blade willmove said scraper laterally along its edge and .scrape the dough fromsaid edge, and means restoring said scraper to its normal position afterdisengagement with said blade.

trough and projecting into the path of said mixer blade, whereby saidblade will move said scraper laterally along its edge and scrape thedough from said edge, and means restoring said scraper to its normalposition after disengagement with said blade.

5. In a dough mixer, the combination -with a trough and a plurality ofrotary helicoidal mixer blades therein, pitched toward each other, of aplurality of scrapers mounted in said trough, one of said scrapersprojecting into the path of one of said mixer blades whereby each saidblade will move said scraper laterally along its edge and scrape thedough from said edge, and a connection between said scrapers whereby theoperative movement of one of them will force the other into position tobe engaged by its blade.

6. In a dough mixer, the combination with a trough and a plurality ofrotary helicoidal mixer blades therein, pitched toward each other, of aplurality of scrapers mounted in said trough, one of said scrapersprojecting into the path of one of said mixer blades whereby each saidblade will move said scraper laterally along its edge and scrape thedough from said edge, and a shock absorbing connection between saidscrapers whereby the operative movement of one of them will forcetheother into position to be 'engaged'by its blade.

7. In a dough mixer, the combination with a trough and a plurality ofrotary helicoidal mixer blades therein, said blades being pitched towardeach other, of a nonrotary shaft mounted in said trough above saidblades, a plurality of non-rotary scrapers slidably mounted upon saidshaft,

one of said scrapers projecting into the path of one of said mixerblades whereby said blade will move said scraper laterally along itsedge and scrape the dough from said edge, and a spring upon said shaftspacing said scrapers apart.- wherebvthe movement of one of saidscrapers will, through said spring, force the other scraper into thepath of its mixer blade.

In witness whereof, I have hereunto affixed my signature, this 19th dayof February, 1910, in the presence of two witnesses.

CHARLES STIRIZ.

Witnesses P. V. \VENING, P. FRANK SONNEK.

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